<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>用户登录</title>
    <link rel="stylesheet" href="css/index4.css">
</head>
<body>
    <div class="login">
        <h2>用户登录</h2>   
        <div class="login_box">
        <!-- lable标签定义控件的标注 -->
        <input type="text" required="required" /> <label>用户名</label>
    </div>
    <div class="login_box">
        <input type="password" required="required"/><label>密码</label>
    </div>
    <a href="javascript:void(0)">
        登录
        <span></span>
        <span></span>
        <span></span>
        <span></span>
    </a> 
    </div>
</body>
</html>